IEC 61557-4:2019
交流1000V和直流1500V以下低壓配電系統的電氣安全保護措施的試驗、測量或監測設備第4部分:接地連接和等電位連接的電阻
Electrical safety in low voltage distribution systems up to 1 000 V AC and 1 500 V DC - Equipment for testing, measuring or monitoring of protective measures - Part 4: Resistance of earth connection a